a current student here
1) Take advantage of the fact that your professors desire to know you and help you to grow. A lot of students brush this fact aside and miss out on amazing opportunities for new friendships/mentors for life.
2) Take your classes seriously, but still have fun. Pay attention in class, show your professors that you care, do your homework, but don't become so obsessed with homework and being a perfectionist that you miss out on dorm life, or just college life in general.
3) Get involved in leadership. Some majors do not allow too much time for much involvement in extra-curricular activities, but try to do what you can without over-bearing yourself. In other words, don't take on three or four different leadership roles and not expect for it to damage your quality in school work. Make sure that what you are taking on is something that you can handle, but don't hold back on doing something great just because you are scared.
4) Manage your time the best you can. This is something that is very difficult for anyone to, but if you can learn how to use your time wisely, you quite the happy camper through-out college. Setting aside specific times to homework or activities is one way to help get onto a schedule.